How long does it takes for windows 10 to do a complete reinstall ?

Jan 3, 2019
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How long does it takes for windows 10 to do a complete reinstall. I have a black screen for more than 5 hours and I don`t want to reboot my PC because it says that my hard drive is in use. How long did it take for you to load?
 
Jan 3, 2019
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I have an M.2 ssd but I did a clean install trough windows also did I a fresh clean up for all my disks.
I have 1 Tb hdd and a 2 Tb hdd. Also my screen goes on standby and after the first seconds goes back on i dont know what that means.
 
Jan 3, 2019
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But is it safe if i dus shut down my pc when it is installing ?
Its also weird when I ask windows to do a clean install they can`t clean my other disks because I can`t have other disks to it connected.